Observation of an anomalous line shape of the η′π+π−mass spectrum near the pp mass threshold in J/ψ→γη′π+π− / M. Ablikim, M. N. Achasov, S. Ahmed [et.al.] // Physical Review Letters. 2016. Vol. 117, № 4. P. 042002-1-0420020-7. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000565882
